Question $2$

Given the data below:

Month Sales$(1000)$

Feb $19$

Mar $18$

Apr $15$

May $20$

Jun $18$

Jul $22$

Aug $20$

$($a$)$

Forecast for Sep. using linear regression $(5$ Marks$)$

$($b$)$

Forecast for Sep. using $5-$period moving average $(5$ Marks$)$

$($c$)$

Forecast for Sep. using exponential smoothing. Alpha is $0\mathrm{.}2$ and the forecast the for march was $19(5$ Marks$)$